When comparing TCL 43UP130 vs TCL S405, the Slant community recommends TCL S405 for most people. In the question“What are the best 4K TVs to use as a computer monitor?”TCL S405 is ranked 2nd while TCL 43UP130 is ranked 7th. The most important reason people chose TCL S405 is:

This 4K TV has everything a good computer monitor needs. It has small input lag, barely noticeable motion blur, decent color accuracy, and full 4:4:4 color support.
As for responsiveness, the TCL S405 is the fastest TV in its price range. It has the lowest input lag (14.9 ms) among all of its main competitors, including the Sony X720E and Samsung MU6300.
Furthermore, the S405 is handling motion blur excellently because of its fast full response time. The full response time of the TCL S405 is 14.4 ms which means that the TV’s pixels can entirely change their colors in 14.4 ms - ten times faster than an average blink. Because of that, fast-moving objects don’t leave trails; thus the TV does not suffer from any noticeable motion blur.

Pros

Pro

Headphone jack allows for a convenient headphone plug

Most TVs don't come with a headphone jack, but it's very convenient to have instead of plugging your headphones into your desktop which is typically placed on the ground.

Pro

Pretty good black levels

Pure black emits 0.036 cd/m² of light, which is pretty good. This makes shadows pop, and help it achieve a very respectable contrast ratio of 4000:1.

Pro

Works well as a computer monitor

This 4K TV has everything a good computer monitor needs. It has small input lag, barely noticeable motion blur, decent color accuracy, and full 4:4:4 color support.

As for responsiveness, the TCL S405 is the fastest TV in its price range. It has the lowest input lag (14.9 ms) among all of its main competitors, including the Sony X720E and Samsung MU6300.

Furthermore, the S405 is handling motion blur excellently because of its fast full response time. The full response time of the TCL S405 is 14.4 ms which means that the TV’s pixels can entirely change their colors in 14.4 ms - ten times faster than an average blink. Because of that, fast-moving objects don’t leave trails; thus the TV does not suffer from any noticeable motion blur.

Pro

Reasonable picture quality

When placed in a dark environment, the S405 can reproduce decent picture quality as the TV's VA panel has a reasonably high native contrast ratio (4171:1), acceptable grey uniformity, excellent black uniformity, and good color accuracy. Regarding the overall image quality, the S405 is on a par with its competitors like the Sony X720E.

Pro

Excellent value for money

Priced below $300 (43-inch model), this 4K TV has enough functionality to compete against more expensive competitors. You’d be hard pressed to find a similar TV in its price range due to its decent picture quality and broad feature set.

Pro

Ads-free interface

The main interface of this TV does not have advertisements. It even has a function to limit ads even in third-party applications.

Pro

Displays colors accurately

Out of the box, the TLC S405 does an excellent job of color reproduction. In fact, you probably won’t even need to calibrate it.

Pro

Can be used up-front

Because of its reasonably small panel size, you can place the 43-inch model of the TCL S405 on top of your work desk and use it as a computer monitor. This is possible because of its small minimum viewing distance (2.2 ft).

Pro

Intuitive user interface

The S405 runs the Roku TV smart OS platform. The platform has noticeably simpler navigation than Android TV, WebOS, and Tizen. Furthermore, the Roku TV does not lack functionality because of its broad app support.

Pro

Good for sports

Due to the TV’s fast response time, the S405 is also an excellent solution for those who like to watch highly dynamic content, such as sports. The 4/5 response time (the parameter which describes how good a TV handles motion blur) of this TV is 6.3 ms. That is a much better response time than some higher-end competitors can offer. In fact, its closest competitors: the VIZIO E-series, Sony X720E, and Samsung MU6300 have worse motion blur handling capabilities than the S405.

Pro

Good for gaming

This TV is an excellent choice for gaming because of its low input lag, well-handled motion blur, and full HDR support. It works well with every new-gen console like the Xbox One X and PS4 Pro because of the TV’s native 4K60 refresh rate. Furthermore, the TV’s low HDR input lag makes it an ideal solution for HDR gaming.

Cons

Con

Wide stand

While most TVs and monitors have a centralized stand which can fit on smaller desks, this TV has legs near the edge of each side of the TV. This means that your desk will need to be as wide as the TV, because virtually none of the TV hangs out past the legs.

Con

Colours aren't balanced

The backlight on this TV is disappointing - it doesn't provide even lighting. Some sections are a bit brighter, and the colours there appear more washed out than other sections. This is a big disappointment for general use, but a really big issue for content creators who rely on accurate colours for photoshop or video production.

Con

Narrow viewing angle

Due to its limited viewing angle, the TCL S405 looks good only when you sit right in front of it. This viewing angle limitation is very common among VA panels, making such TVs not suitable for group watching.

Con

Not all HDR formats are supported

This TV is compatible with HDR10, but not with Dolby Vision content. While HDR10 has more content, Dolby is aggressively pushing Dolby Vision towards content makers.

Con

Not suitable for bright rooms

This TV is not bright enough to fight glare when placed in a luminous environment.

Con

Remote lacks functionality

The TCL S405's remote is very basic and has limited functionality. It can only be used for navigation and sound level control, which is not that much since many modern TV remotes have advanced functions.

Con

Poor sound quality

The stereo speaker system sounds horrible and cannot get louder than 91 dB. Adding a relatively cheap speaker system or a soundbar will make a huge difference.